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On the origin of trigger-angle dependence of di-hadron correlations

Authors
  • Qian, Wei-Liang
  • Andrade, Rone
  • Gardim, Fernando
  • Grassi, Frederique
  • Hama, Yogiro
Type
Preprint
Publication Date
Aug 20, 2012
Submission Date
Jul 26, 2012
Identifiers
DOI: 10.1103/PhysRevC.87.014904
Source
arXiv
License
Yellow
External links

Abstract

The STAR Collaboration reported measurements of di-hadron azimuthal correlation in medium-central Au+Au collisions at 200 A$\,$GeV, where the data are presented as a function of the trigger particle's azimuthal angle relative to the event plane $\phi_s $. In particular, it is observed that the away-side correlation evolves from single- to double-peak structure with increasing $\phi_s$. In this work, we present the calculated correlations as functions of both $\phi_s$ and particle transverse momentum $p_T $, using the hydrodynamic code NeXSPheRIO. The results are found to be in reasonable agreement with the STAR data. We further argue that the above $\phi_s$ dependence of the correlation structure can be understood in terms of one-tube model, as due to an interplay between the background elliptic flow caused by the initial state global geometry and the flow produced by fluctuations.

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